Kenma and you were close friends, most people knew that, you often hung out with him and Kuroo, part of being friends with Kenma meant he'd pick up quirks and speaking mannerisms from people he was closest to pretty often, you had speaking habits and different quirks, the hand on the hip, the subtly chewing gum, the look over of your nails, etc etc, he'd never realized that'd happened with you, not until today, Yamamoto had commented on his serve and Kenma responded with one hand on his hip and said

"yeah? and?" Kenma hadn't noticed how completely sassy and how.. you, it was until Kuroo cackled

"Kenma! yeah and? that's amazing!" Kuroo cackled

"what what! since when'd you get all that sass?" Yaku said with a curious head tilt

"I think our sass is nearby waiting for me and Kenma to walk home with her" Kuroo said with a chuckle as Kenma had a silent crisis, his crush on you wasn't just sleep depravation, he really genuinely was crushing on you and he knew it